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Genome-wide association study for phosphate deficiency responsive root hair elongation in chickpea

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Abstract

Root hairs (RHs) are single-celled elongated epidermal cells and play a vital role in nutrient absorption, particularly for immobile minerals like phosphorus (P). As an adaptive response to P deficiency, an increase in RH length enhances root-soil contact and absorptive area for P absorption. Genetic variations have been reported for RH length and its response to P deficiency in plants. However, only a few association studies have been conducted to identify genes and genetic loci associated with RH length. Here, we screened desi chickpea accessions for RH length and its plasticity under P deficiency. Further, the genome-wide association study (GWAS) was conducted to identify the genetic loci associated with RH length in P deficient and sufficient conditions. Although high variability was observed in terms of RH length in diverse genotypes, majority of the accessions showed typical response of increase in RH length in low P. Genome-wide association mapping identified many SNPs with significant associations with RH length in P-sufficient and P-deficient conditions. A few candidate genes for RH length in P deficient (SIZ1-like and HAD superfamily protein) and sufficient (RSL2-like and SMAP1-like) conditions were identified which have known roles in RH development and P deficiency response or both. Highly associated loci and candidate genes identified in this study would be useful for genomic-assisted breeding to develop P-efficient chickpea.

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Funding

This work was supported by the DBT-Innovative Young Biotechnologist Award (IYBA) [BT/010/IYBA/2016/04]. PSK acknowledges DBT-Junior Research Fellowship (JRF).

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Correspondence to Jitender Giri.

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The authors declare that they have no conflict of interests.

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Supplementary Figure S1

Phenotyping pipeline and root hair measurement for chickpea accessions in +P and in –P condition. (PNG 5.23 mb)

High image resolution (TIF 8.53 mb).

Supplementary Figure S2

Percentage change in root hair length from +P to –P condition in 100 desi chickpea accessions. (Green bars- Increase, Red bars- Decrease). (PNG 5.23 mb)

High image resolution (TIF 1.57 mb).

Supplementary Figure S3

Representative image of chickpea accession Vaibhav in +P and –P condition. (PNG 5.23 MB)

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Supplementary Figure S4

Genome-wide association study for the root hair length trait in different conditions using CMLM model. (PNG 5.23 mb)

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Kohli, P.S., Kumar Verma, P., Verma, R. et al. Genome-wide association study for phosphate deficiency responsive root hair elongation in chickpea. Funct Integr Genomics 20, 775–786 (2020). https://doi.org/10.1007/s10142-020-00749-6

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  • DOI: https://doi.org/10.1007/s10142-020-00749-6

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